Improvement in padlooks



@auch istria @anni @Hita M. P. THATCHER, OF PONTIAC, MICHIGAN.

Letters Patent No. 73,136, date January 7, 1868.

IMPROVEMENT IN PADLOGKS.

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'ro ALI. WHOM IT MAY-conciliari:

Be it known that I, M. P. THATCHER, of Pontiac, in the county ofOakland, and in the State of Michigan,

-have invented certain new and useful Improvements in Padlocks; and dohereby declare that the following is a full, clear, and exactdescription thereof, reference being' had to the accompanying drawings,land to the letters of reference markedthereon. y l

In the annexed drawings, making part 'of this specification, A and Brepresent two metallic plates, which form the side pieces of this lock.VThe plate A has upon its inner side, near each end, two l'l'ollowcylinders. G represents one, and E the other of these cylinders. Thecylinder E has a long slot, e, running from one end of it to the other,and communicating with its centre opening., Surrounding the cylinder Eis a series of wheels,

' F F, which fit loosely over and'revolve upon it. The eye of each oneof these wheels is provided with a crossslot, the object of which willbe described. The plate B is provided on its inner side, near each end,with two shafts, C and D. The shaft C fits snugly within the cylinder Gof plate A. Shaft D is provided with a series of wings, a r1, which,when the said shaft is inserted in cylinder E', project through the slote e and between the wheels F F. Each of the wheels has a portion. ofthemctal on one face turned away, leaving a socket or cup, and it is inthese sockets that the wings a a rest. The wheels F are each provided ontheir peripheries with a series of letters, and one letter of eachseries is placed immediately over the cross-groove in the wheel, so asto indicates where the groove is. A mark is made upon each of the platesA and B, as seen at T and Y, which indicate the line of the groove ihcylinder E, and also show on what line the letters on the wheels andover the cross-grooves should be placed. The lettersKR U S T, in thiscase, stand over the grooves in the wheels, and hy arranging theseletters in line with the letters T and Y, on the plates, the shaft D,with its wings, will draw out from cylinder E. Should one of the groovesin one of the wheels not he in line, the shaft D could not be drawn out.Those letters which indicate the direction of the grooves in the wheels,are of course the key to the lock, for without knowing these the lookcannot he opened.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is The arrangement of the plates Aand B with their shafts and cylinders, as constructed and used, incombination with the wheels F F, as and for the purpose specified.

In testimony that I claim the foregoing, I have hereunto set my hand,this lstday of August, 1867.

M. P. 'TI-IATcnnn.

Witnesses:

A. W. BURTT, J. D. Hommes.

